mrg 90d9434890 keep track of which cpu's have run a pmap and only broadcast tlb flushes to
cpu's who have done so.  implement pmap_deactivate() for MULTIPROCESSOR and
call it from cpu_switch() when we are about to switch proces and when we
enter idle().

with this change, i see significantly reduced tlb IPI traffic and fork/exec
bound processes -- such as "configure" -- run significantly faster, upto
15%.  i also obvserved a small (0-2%) benefit to CPU bound tasks as well.
2003-01-11 03:40:31 +00:00
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